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(No Model.)

Patented Feb. 12, 895.

'-ro ma HIGH PRESSVRE-EXHAUST.

' Ira/@wrz- NITED STATES PA'rErrr` EEIOE.

THOMAS WILLIAM WORSDELL, OF

LAPAGE, OE SURBITON, ENGLAND.

OOMPOUNDENGINE.

OAMFORTH, AND RICHARD HERBERT I SPECIFICATION' forming part of Letters Patent No. 534,193, dated February 12, 1895.'. Appiicanon niet January 6,1894. sean No. 495.992. (No model.) `Patentamt England Apm'i 22,1992,N0.7,6'47.

To @ZZ wiz/m it may concern:

Be it knownthat I, AUGUST VON BoEErEs, a subject of the King of Prussia, residing at Herrenstrasse, Hanover, in the Empire of 5 Germany, have invented Improvements in Compound Engines, (for which Letters Patent have been obtained in Great'Britain, No. 7,647, dated April 22, 1892,) of which the following is a specification. y

This invention of improvements in compound engines has referenceto the valve apparatus used in such engines whereby they can be Worked, at will, either as compound engines or as non-compound engines. v x5 In my United States patent dated December 26, 1893, No. 511,581, I have described a construction of valve apparatus for the purpose mentioned in which the connecting passage between the high and low pressure cylinders, a high .pressure exhaust port, and a f steam passage by .which live steam can flow at a reduced pressure to the .steam chest of the low pressurek cylinder, are controlled by intercepting exhaust, and auxiliary steam re- Iducing valves which are moved in one direction to close'the connecting passage and open the exhaust and livev steam passages, vwhen the engine is to work as a non-compound engine, by the pressure of live steam admitted 3o to one end of a cylinder fitted with a pistonv connected with the said valves, the valves being automatically moved in the opposite direction to open the connecting 'passage and close the exhaust and live steam passages, when the engine is to work as a compound engine and the supply of live steam to the live steam passage is cut OE, by reason of the pressure of the steam in thelow pressure steam pipe on the valve controlling 'the connecting 4o pipe between the high and low pressure cylinders being then unbalanced by the pressure of live steam on the said piston. Now my present invention has reference to iinprovements in or relating to valve apparatus of this and similar kinds, and it has for its object to effect each of the above mentioned movements of the Valves by the action of duid pressure at the will of the engine driver, so as to thereby obviate any liability that may 5o arise of the said valves not automatically moving into position for working compound, by reason of the pressure on the low-pressure side of the engine falling too low from any cause, as for example owing to the steam supply having been cut oft and the engine allowed to run empty for some time, after previously working as a non-compound engine. For this purpose I connect the said valves to a piston arranged to work in a cylinder to each end of which motive Huid is or may be 6o Vadmitted at will, the arrangement being such as to form a double acting or diEerential fluidpressure motor under the control of the engine driver. The said-cylinder may be separate from the chamber through which live steam passes to the auxiliary steam-reducingl valve, or it may form part of such chamber as in. the example hereinafter described.

In the accompanying drawings, Figures l and 2 show partly in longitudinal central sec- 7o tion and partly in elevation, valve apparatus constructed according to this invention, Fig. 1 showing the valves in' position for working the engine to which they are applied as a compound engine,lwhile Fig. 2 shows the valves 75 in position 'for working the engine as a noncompound engine.

A is the valve case formed with a passage B, B arranged to form part of the connecting pipe or receiver B2 between the high and low So' pressure-cylinders, and with another passage C in communication with a high pressure exhaust pipe C.

D is a combined exhaust valve and intercepting valve adapted to control an exhaust port or passage E between the passages B B vand O, and also .the communication between the high and low pressure cylinders through the said passageB B. A,

F is a piston arranged to work in a cylinder F that is secured to one side of the valve case A and is provided with live steam inlets G, G at its inner and outer ends respectively.

H, H is a rod'of two diameters connecting the valve D with the piston F and Working through a plate I separatingthe passage B, B from the cylinder F. This rod serves as a steam reducing valve that serves to prevent 'live steam flowing to the low pressure cylinder until the valve D is fully open as shown roo .I and J are pipes connecting the steam inl lets G G respectively with the high pressure steam supply pipe K for the high pressure cylinder L.'

N is a valve case formed with three pas-` sages N N2 N3 communicating respectively with the steam inlet G', the live steam pipe J', and the external atmosphere.

O is a val-ve that is held in the position shown in Fig. l by the pressure of live steam thereon, when the engine is working as a compound engine, so as to open communica tion betweenthe `passages N and N2 and close the passage N3.

Pis alever arranged lo act against thestern O of the valve O and connected to a rod Q whereby the engine drivercan move the said valve from the position shown in Fig. l to that shown in Fig. 2 when it is desired to Work the engine as a non-compoundengine. In the latter case, the outer end of the piston `will be subjected only to the pressure ofthe external atmosphere so that the steam acting upon its inner end will readily move `it and the connected valves from the positions shown-in Fig. l to those shown in Fig. Qthereby closing the communication between the lhigh `and low pressure cylinders and openingthe exhaust port E and also the annular steam passage I so that live `steam can then'lowfrom the pipe .I by Way of the inlet G, and inner end of the cylinder F into the pipe B at the loW pressure side of the valve D, at a reduced pressure,

and thence `to the steam chest of the `lou7 pressure cylinder. In the former case both ends of the piston F will be subjected .to the pressure of live steam entering by theinlets G G' but since the outer endis of greater area than the inner end, in consequence of the rod II `I-I being connected thereto, the pressure onthe former will exceed that onthe latter with the resultthat the piston and connected valves will be moved by such excess of pressure from the position shown in Fig. 2'to that shown in Fig. l, Whether there be any steam pressure in the passage B B2 leading to the low pressure cylinder or not.

In the example shown the valve O is a disk valve operated in one direction by the steam pressure and in the opposite direction by the lever, but it will be obvious that other types of valves or cocks can be used if desired for the purpose mentioned, and be operated in each direction by a rod or lever under the control of the :engine driver. The relative areas of the inner ends of the valve D and piston `subjected `to live steam pressure, should be such that the total pressure of the live steam on the piston F will equal that of the steam at lower pressure on the valve D sothat the reducing valve II I-I will be caused to automatically vary the supply of steam through the opening I in accordance with variationof the pressure Ain thepassage B B2 as fullyexplained in my said former specilication.

As will be obvious a double acting or differential Huid pressure motor such as described may be used `rin conjunction with various arrangements `of intercepting valve tor changing theworking of compound engines from compound to `non-compound and vice versa Whether exhaust fand auxiliary steam `red ucingvalves becombined therewith onnot.

The combination of `the high kpressure exlhaust, the passage to the low `pressure cylinder, valve D for rcontrolling the communica- :tion between `the exhaust and `said passage, `cylinder F', a Valved connection between the same andlthepassage to thelow pressure cyliinder, live steam ,piped leading to the inner rend ofthe cylinder,similar pipe J connected Lto its outer end, valve@ normally closing the iouteriendof'the cylinder to the outer air, the `valve `being so held `by'thepressurein pipe J', 1a Vmechanism for moving said valve to close @pipe Jand open the cylinder to the outer air, Athe single piston F in `cylinder-I1" for operatling valve D and ot' such areas at itsends as `to subject `its outer end to greater pressure :than its inner end, whereby said piston will sbe held `normallyatthe `inner end ot" `the cyliinderwith valve D so `held as to `have the enigine Workcompoundsubstantially.as shown land described.

In testimony whereof I Jhave signed my inameftothis specitication inthe presence of atwo subscribing Witnesses.

KARL DAMMANN,

Both of Hanover.

IOO 

